Improvement in stereoscopes



PATENT( OFFICE.

'JO'HNPAGnINenLoF New xonk, N. Y., AND JonN Anni'ro, 0F HOBOKEN, Ij NEW.mesma ,INSTEREoYsc'cPEsQ New York,l "and JOBNARDIrQ., of Hoboken, g

Hudson. Ycounthew Jersey, have invented a f illewand-usefl Improvementin StereoSCOpeSg ,ofwhichthefollowing.isaspecilication:

vFigure Y 1 is a` side kview of' our improvedf ,stereeseope showingthe'zpillar in. centralsection; E Fig. 2isaverticalcross-section through-thejoint ofthe .haudlexor 'Pillar at the bottom of the instrument.Figiisy ,a detail top view of the'spring-slide before ther same isapplied tojgthe:base-plateofthe instrument.' Fig. 4' is averticaltransverse section on the line c 7c, Fig. l; Fig. 5, a transversesection ofthe same on the' line c @Fig-L3. Fig.u6 is a detail side viewof the lowerpart ofthe pillar. Fig.` 7 lis a vertical section thereof,showing the legs folded down. Fig. 8 is-a horizontal section on the linek k, Fig. l.

Similar letters of reference indicate corresponding parts in all thefigures.

This invention has for its object to simplify the construction of theslide ot' aA stereoscope, and to dispense with the use of separatefriction-springs; also to improve the construction ofthe swivel-joint atthe bottom of theinstrument, and the mode of attaching the legs to thepillar.-

The invention consists of the improved con. struction and combination ofparts hereinafter more fully described.

The letter A in the drawing represents the supporting-pillar of thestereoscope. B B are the legs which support said pillar. C is thebase-board of the instrument, swiveled to the upper end of the pillar orof the handle D,

which constitutes'the upper extremity of said pillar. E is thelens-holder affixed to the board C, and F is the extension-slide orpicture-holder.

i The general disposition of the parts hereiniSpecificationformingpartof,Letters Patent Nodl'llgls, datedv Marcl1 7,1876.; application filed f1 l yFebruary8,1876. v'

Aformed either byy grooving ythe surface of the yboard alongand parallelwith its edges, or by aflixing thereto metallic or other strips thatproject beyond the surface of the board. The

jaws b bfit over and partly around said ledges, and `areheldand. guidedby, the same,` the `gripe ofthe jaws on theledgesbeing suflicientlyfirmto enable ,us to dispense with separate .frietion-sprin gs, 'now'usually employed.' 'Additional springis or may be obtained by soybending the side bars a a inward on the cross- .bar e, fromjwhichftheyproject', and as ,indicated'in Fig. 3, that they will be'afterwardspread-bythegboard C, which they straddle,

`and caused to exert/spring-pressure against the` edges of .thesame Tothis endwe `find it advantageous to construct the two side `bars a a inone piece witha ltransverse connectingbar,f, whichis screwed to thecrossl bar e, and to partly double the back ends of said bars a againstsaid bar f, as shown at g, in Figs. 3 and 5. By this arrangement a iirmconnection of the side bars a with the cross-bar e is ob-l tained, andthe joint at-the same time made to constitute a stili' spring. But thepiece f may, if desired, be made of two or more pieces. end of the boardC is used to preventV the entire withdrawal of the jaws b from the boardC. To the under side of the board (l is firmly attached asocket, G, ofnearly hemispherical form, slotted at the bottom to admit the shank ofthe ball H, which projects from the handle D or pillar A. This ball H wemake of two hemispherical cups, h It, which constitute the upper ends ofilat or nearly liat metallic shanksi i that are secured in the handle'orpillar. The shanks t' t', with their appendages h h, are bent slightlyapart, as indicated in Fig. 2, to constitute friction-springs, and causethe ball, which is formed by the cupsh h, to Work'tight'in the socket G.By this means we can dispense with the employment of a separatefriction-spring, now usually employed inthe socket. j is a cushion orplate l,of cork, or equivalent material, inserted Within the socket Grdirectly above the cups h h, to prevent the latter from playing up anddown within the socket. The lower end of the pillar A stands on a plate,I, to which the three A suitable stop applied to the rear.

' lor more legs B B are pivoted by short pins l l, as shown. Beneath theplate I is another plate, J, which connects, by a central pin, m, withthe body of the pillar, and which has as many notches n n as there arelegs B B, and equally spaced as said legs. J is turned below the plateI, Ato bring its notches n directly beneath" the upper pivoted parts ofthe legs B, as in Fig. 7, the legs will, on their pivots, swing inward,as indicated by dotted lines in Fig. 7, and are then in convenientposition for packing and transport-ation.

But when the instrument is to be set up,'the legs are spread out, as inFigs. 1 and 6, and the plate J then turned to bring its nonnotchedportions under the\pivoted parts of the legs, thereby locking them intheir spread and supporting position, as in Fig. 1. The

pin m projects from the plate J, through a central aperture ofthe platel, and thence `into the pillar A, to which it is lockedv by a4transverse pin, o, or equivalent fastening.

the end of the opposite turnthe plate J will properly lock the legs inthe extended position. By withdrawing the piu o the parts A, I, and J,can be taken apart.

We claim as our invention- When the plate 1. In a stereoscope thesliding side bars a a rigidly connected with the sliding jaws bb, whichare adapted to lap around the edges of the board C, along which theyslide, substantially as specified.

2. The board G of a stereoscope made with the projecting parallel ledgesd to be embraced by the jaws I on the slide-bars a, substantially asherein shown and described.

3. In a stereoscope the side bars a a, made with thelaterally-projecting portions g g,which serve as spring-supports of saidbars on the connecting cross-piecef, substantially as herein shown anddescribed.

4.'. The combination of the handle or pillar of a stereoscope with thetwo projecting metallic blades z', and with the hemispherical cups h andh, which are formed on the upper ends of said blades, respectively,substantially as herein shown and described.

5. The combination of the pillar A with the plate I, which carries thepivoted legs B B, and with the movable plate J which has the notches fn,n, substantially as herein shown land described.

6. The combination of the pillar A with the plate I, legs B, notchedplate J, center pin m, and locking-pin o, substantially as herein shownand described.

